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Cover Page - shares | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Entity Information [Line Items] |  |  |
Document Type | 40-F |  |
Document Registration Statement | false |  |
Document Annual Report | true |  |
Document Period End Date | Dec. 31, 2021 |  |
Current Fiscal Year End Date | --12-31 |  |
Entity File Number | 001-37946 |  |
Entity Registrant Name | ALGONQUIN POWER & UTILITIES CORP. |  |
Entity Incorporation, State or Country Code | Z4 |  |
Entity Address, Address Line One | 354 Davis Road |  |
Entity Address, City or Town | Oakville |  |
Entity Address, State or Province | ON |  |
Entity Address, Postal Zip Code | L6J 2X1 |  |
Entity Address, Country | CA |  |
City Area Code | 905 |  |
Local Phone Number | 465-4500 |  |
Security Exchange Name | NYSE |  |
Annual Information Form | true |  |
Audited Annual Financial Statements | true |  |
Common Stock, Shares, Outstanding | 671,960,276 | 597,142,219 | 524,223,323
Entity Current Reporting Status | Yes |  |
Entity Interactive Data Current | Yes |  |
Entity Emerging Growth Company | false |  |
Entity Central Index Key | 0001174169 |  |
Amendment Flag | false |  |
Document Fiscal Period Focus | FY |  |
Document Fiscal Year Focus | 2021 |  |
6.875% Fixed-to-Floating Subordinated Notes - Series 2018-A due October 17, 2078 |  |  |
Entity Information [Line Items] |  |  |
Title of 12(b) Security | 6.875% Fixed-to-Floating Subordinated Notes – Series 2018-A due October 17, 2078 |  |
Trading Symbol | AQNA |  |
Security Exchange Name | NYSE |  |
6.20% Fixed-to-Floating Subordinated Notes - Series 2019-A due July 1, 2079 |  |  |
Entity Information [Line Items] |  |  |
Title of 12(b) Security | 6.20% Fixed-to-Floating Subordinated Notes – Series 2019-A due July 1, 2079 |  |
Trading Symbol | AQNB |  |
Security Exchange Name | NYSE |  |
Common shares |  |  |
Entity Information [Line Items] |  |  |
Title of 12(b) Security | Common shares, no par value |  |
Trading Symbol | AQN |  |
Corporate Units |  |  |
Entity Information [Line Items] |  |  |
Title of 12(b) Security | Corporate Units |  |
Trading Symbol | AQNU |  |
Business Contact |  |  |
Entity Information [Line Items] |  |  |
Entity Address, Address Line One | 111 Eighth Avenue |  |
Entity Address, City or Town | New York |  |
Entity Address, State or Province | NY |  |
Entity Address, Postal Zip Code | 10011 |  |
City Area Code | 212 |  |
Local Phone Number | 894-8940 |  |
Contact Personnel Name | CT Corporation System |  |

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